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I'm a color junky- And I'm most interested in the Fuji X-T3 Or any of their Medium format GFX cams like the 50S or that epic 100mp coming out... but I'm also very interested in the Sigma Foveon cameras like the Sigma sd Quattro H
Two topics of interest...
When is the new full-frame Sigma Foveon Camera going to be released this year? And will it actually have a video mode as well as a crop mode for photos and or video to go back down to APS-C or H??
Does anyone have insider info on this... would really like to finally know this release day
Furthermore, has anyone done tests (and can post the results) of a comparison between a Fuji XT-3 (or GFX) to the Sigma Quattro H??
Any sort of comprehensive test to see the difference between the color rendition, accuracy, gamut, and dynamic range between Foveon and Eterna would be very interesting. Post links you know of!!

hmmm Okay to that's good to know. Though testing for Dynamic range could be affected by shutter speed though as a result of the shutter letting in more or less light/second right?? I was figuring this is the reason for the various results of DR being measured for a given camera.
So you're saying that these Dynamic range results appply equally both in the camera's still and video mode?? Somehow I doubt this because there's a higher color bit in stills mode than in video modes and such? Right?
For iso then: Fuji x-T3 base for stills is iso160 while for video is iso640
For the canon 5diii with magic lantern is iso100 in stills and then....iso400 in video? Please confirm
So what're the definitive dynamic ranges for these two models?

Does anyone know the dynamic range of the Fuji X-T3 when taking video as well as stills when the shutter speed is set to 1/50th??
Same goes for the Canon 5diii with Magic lantern for comparison. And yes, the closest shutter on the 5diii to get to that is using 1/48th
Would be great to confirm a comparison.
The reason for wanting to know the actual dynamic range of both camera at this shutter speed of 1/50th (or whichever option is closets) is because I only ever use this shutter speed of 1/48 on my 5diii because it's the proper pairing with 23.98 or true 24fps when shooting video. So I therefore only ever take pictures using this shutter speed as well in order to keep everything consistent.
I've noticed countless DR tests go all over the place with the 5Diii, but usually, they're more or less worthless readings since nobody would ever shoot video at 23.98fps combined with say... 1/8s shutter. Please correct me if I'm off base here....
Also, I think I saw that in video mode for the Fuji, the native iso is actually higher than it's native iso for stills (640iso for video vs 160 for stills)... is this true? Does a similar scenario apply the 5diii? I know that it's native iso is 100 for stills, but perhaps its native for video is 400iso or something else?
regardless, shutter speed is independent of iso speed.

Hmm Metabones it is then. Strange though -- they have canon FD to Fuji X... which is worthless, and yet (speedbooster or not) don't have a single 'EF' to Fuji X adaptor
ughh...
I'm patient to wait. Maybe the Panasonic FF cams will have a aspH or s35 crop mode for stills and video to be an alternative to the Sony's that do so... but ehhh, I truly then rather really be patient and wait to save up for a medium format Fuji and use my FF lenses on it with that fotodiox adaptor switched to 35mm mode. Or to save half the money, I'll wait and see if the Sigma FF will have a crop mode to compete. Either way-- it's looking like the fuji X-T3 is out as an option without there being such a speedbooster I'm referring too. So again: that leaves, Sigma FF, Fuji medium format + 35mm adaptor, or too just settle on a FF Sony/Panasonic or m43 GH5
Yup... all will be clear by midway through the year on the new models coming out. Gee I do wish Fuji would surprise us with a premium apsH model... ohh the wonder it could be
BTW... has anyone found a Speedbooster of any degree for EF to Fuji X??? I have not...

Yeah... I just really do not like Panasonic-- forgetting the whole anamorphic 4:3 mode options such (we are in the ana thread), I just think the colors, skins tones, higher MP, and the larger native sensor size to start from is great with either a Sigma or Fuji.
Lamely, the Sigma foveons don't have video modes (absurd!) but crossing fingers that this will change with their FF coming out this year. Plus... it won't have that ridiculous SA mount (which any third party still has yet to make an EF to SA adapter for!) thus making it useless. Thank goodness for the L Mount alliance.
Now I know I could get a sony A9 or a7sii and such which does have a s35 crop mode on these FF cams.. this is the great feature and ideal feature but the inflated cost and lack of color personality in the sony's don't make them all too attractive for me.
For curiosity of comparison-- does anyone know the actual dimensions of the sensor size these sony's become when in s35 mode?? I always wonder if they are just using the euphemism of 's35' but that it's actually cropping further to a smaller apsC or H mode?? Please confirm
The only other FF cam with this s35 crop feature was the Canon 1DC -- which I loved, but at this point it is only 8 bit and works off the sparsely used codec of Motionjpegs
Where I got the whole 0.85x focal reducer is from the Aputure LensRegain
https://www.aputure.com/products/DEC-LensRegain?variant=22741298630
It states .75x but from review tests it is actually confirmed to create a .85x
*****However: this adaptor is made for Canon EF to 'MFT' mount cameras.... so the gh5 in other words. Though if this .85x crop were to be applied on an apsC camera like a Fuji it would result in that sensor size I desire.
So coming full circle now.... do any of these adapters: Metabones, Viltrox, Mitakon Zhongyi, K&F Concept, FOTOMIX Fringer, Kipon Baveyes, or Fotodiox... have a different crop factor (more crop) then what the given model claims???
Lastly, wouldn't it be just epic to have an adaptor like this here (with nifty a 35mm switch on the side).. this would be so great to put on an X or L mount cam. I could try double adapting??? this EF to fuji G mount-- onto a G to X mount? Don't know much about these methods though
https://www.fotodioxpro.com/products/eos-gfx-pro-fusion
Fun Times

Alrighty here we go!! thank you
The be-all-to-end-all-grand-daddy question: does anyone know of a speed booster (or simply a focal reducer) at 0.85x??? If so which is the best one for quality?? Or I could also ask, which is the best speedbooster marked as 0.726x, 0.71x or 0.64x but in all actuality has a true measurement of about a 0.85x focal reduction???
My plan: find a .85x speed booster that is Canon EF to Fuji X -- so I can use my large collection of full-frame EF lenses on a Fuji X-T3
Alternate plan: wait to see if the New Sigma FF Foveon camera actually has a video mode + an aspH or s35 sensor crop mode for both stills and video... not holding my breath (doesn't the Sony A9 have this though? Meh... I'm a Fuji or Sigma lover
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My calculations for reference of when attempting to get a digital sensor equivalent as close to 4 perf super 35 cinema as possible on an slr:
Original 4 perf=
23.16 x 18.16mm
Current 4 perf=
24.89 x 18.66mm
RED Helium=
29.90 mm x 15.77mm
Comparison:
M43
17.3 x 13mm (not wide enough / not tall enough)
ApsC
23.5 x 15.6mm (wide enough / not tall enough)
ApsH
26.6 x 17.9 (too wide / not tall enough)
SENSOR AS IS:
ApsC 23.5 x 15.6mm (NO: wide as film but not as digital / not as tall as film or digital after crop)
ApsH 26.6 x 17.9 (YES: between width of film and digital / BUT not tall as film YET tall as digital after crop)
WITH SPEED BOOSTER:
Original 4 perf = 23.16 x 18.16mm
Current 4 perf = 24.89 x 18.66mm
RED Helium = 29.90 mm x 15.77mm
- X0.85
M43= 20.35 x 15.29mm (NO)
ApsC= 27.64 x 18.35mm (YES: between width of film and digital / tall enough for film and digital after crop) CLOSEST EQUIVALENT~ THE WINNER!!!!
ApsH= 31.29 x 21.05mm (NO: wider then film and digital / too tall for film and digital)
- X0.75
M43= 23.06 x 17.33mm (NO: not as wide as film or digital / not tall enough for film but taller than digital
ApsC= 31.33 x 20.8mm (NO: too wide for film and digital / too tall for film and digital
ApsH= 35.46 x 23.86 (NO: too wide for film and digital / too tall for film and digital
- x0.726
M43= 23.83 x 17.9mm (YES: wide enough for film BUT not digital / NOT tall as film YET tall as digital after crop)
ApsC= 32.36 x 21.48mm (NO: too wide for film and digital / too tall for film and digital)
ApsH= 36.63 x 24.65 (NO)
- x0.71
M43= 24.36 x 18.30mm (YES: wide enough for film but not digital / tall as film and digital after crop)
ApsC= 33.09 x 21.9mm (NO: too wide for film and digital / too tall for film and digital)
ApsH= 37.46 x 25.21mm (NO)
- X0.64
M43= 27.03 x 20.31mm (YES: between width of film and digital / tall enough for film and digital after crop) The closest 'smaller sensor size' equivalent
ApsC= 36.71 x 24.37mm (NO)
ApsH= 41.56 x 27.96mm (NO)

ummm.... is your math calculations correct? I'm trying for the life of me to replicate your figures for the maths on the GH5 4:3 sensor and Speedboosters:
17.3 X 13mm
X0.64= 27X20mm
X0.71= 24.3X18.3mm
- For the Metabones Speed Booster XL 0.64x wouldn't it be both width (17.3) and height (13) multiplied by 1.64? So instead it would come out as...
https://www.metabones.com/products/details/MB_SPEF-m43-BT6
X0.64= 28.37X21.32mm
- Same goes for the ULTRA 0.71x
https://www.metabones.com/products/details/MB_SPEF-m43-BT5
X0.71= 29.58X22.23mm
- And the Zhong Yi Mitakon Lens Turbo Adapter Mark II .726x
https://zyoptics.net/product/mitakon-lens-turbo-adapters-mark-ii-for-m43-mount-camera/
X0.726= 29.85X22.44mm
Correct?... Or am I missing something here. How did you come out with X0.64= 27X20mm and X0.71= 24.3X18.3mm???
For the sake of comparison if choosing an APS-C or APS-H camera and using a speed booster with FF lenses... The sensor sizes would calculate from the Fuji X-T3 starting at 23.5mm×15.6mm (APS-C) to what??
- Using the Zhong Yi Mitakon Lens Turbo Adapter Mark II at 0.73x magnification (36mm FF width multiplied by .73 and 24mm FF height multiplied by .73) OR no??
https://zyoptics.net/product/lens-turbo-adapters-mark-ii-for-fuji-mount-camera/
X0.73= 26.28X17.52mm
- And for an APS-H camera like the Sigma Quattro H at 26.7×17.9mm itwould become... ehhh idk?!... this can't be the right math i'm using because these sensor sizes numbers are coming out smaller than a boosted m43 sensors... I don't know how to derive these figures!!!
Please help.
And any links/recommendations to focal reducers for an FF canon 'EF' to Fuji X mount adaptor... in the best quality for the various reducer size options, do let me know!

Yes I totally made that explanation confusing. To clarify. I'm trying to get to the closest digital size as if I were shooting 4 perf 35mm film BECAUSE I know that anamorphic was created for that image size format AND THUS for 35mm lenses with an image circle to cover the size for that film negative. So X0.71 on a m4/3 sensor at 24.3×18.3mm is pretty darn close to that original film size of 23.16×18.16mm﻿ (which the cropped from 2.66 to 2.55)
Caleb, can you please write out/explain the arithmetic for how you derive the mm dimensions? Reason being, I do know of another speed booster which is slightly different at 0.726x and would like to know what size that one would results as in order to compare.
https://photogear.co.nz/zhongyi-lens-turbo-ii-ef-to-m43.html
The confusion has arisen because of the whole FF lenses thing. I don't want/or care about the equivalency FOV of FF format. I care about attain the equivalent FOV for 4 perf cinema at all times as my reference point and thus want to be working in a digital equivalent sensor size through the of the best speedbooster to attain this sensor size (and thus closest FOV)
for me a 50 is a 50 is a 50mm in regards to the characteristics of that focal length.
I the reason I brought up my FF lenses is simply because I do not want to purchase an entirely new set of s35 or apsC lenses because I've already got a ton of ziess ZF2 prime lenses (which are FF). I simply want to shoot down the center of the barrel of these FF lenses (and thus no maxing out their entire image circle which would introduce vignetting)
So with that, if I was to use my 25mm or 35mm zeiss ZF2 primes as the taking lenses on this smaller m43+ speed booster combo I suspect I would certainly be able to get down to the equivalent FOV of those very same focal lengths of this 4 perf 35mm film format without vignetting????
Furthermore, I would NOT use a s16mm projector lens as my anamorphic 2x front element since this is a smaller image format as well. I would use a 2x 35mm projector lens instead OR even a lomo square front, or something else for that matter (any other x2 recommendations are appreciated)
So yeah... not avoiding smaller format projector scope lenses as well as avoiding the utilization of the larger image circle available in the FF lenses in order to meet in the middle of my desired shooting format size as it was intended for but just through the use of these different tools (m43 sensor / speedbooster combo / 35mm 2x scope element)
Will it work??

Ohh thank you so very much for this info!!
My whole thing is to get to a 4:3 mode on a digital sensor that is closest to the specs size of 4 perf 35mm film. This original anamorphic cinemascope is 23.16×18.16mm﻿
So it looks like a X0.71 speed booster would be perfect for FF lenses on a m4/3 sensor since it results in 24.3×18.3mm
This is even closer than aps-H at 26.7×17.9mm
Cool. So here is my question then: would this m4/3 + X0.71 speed booster combo allow for being able to go to wider focal lengths before vignetting when paired with FF lenses??
In other words, does this crop mode and focal reducer method solve the problem of the typical FF lens/FF sensor combo that can't go wider than 40-50mm lenses when using 2x scopes?
I'd like to get down to 25mm focal length lenses to use and so I'm trying to find a method to get out of the larger FF sensor sizes (which is causing the problem) while not going smaller than traditional 35mm film. All these ana scopes were made for this format after all...

Yeah that would be perfect-- don't know if it exists though: a 35mm 4:3 crop mode for anamorphic .... yes, please!? But... again on the ML's canon's -- they have NEVER figured out how to simultaneously jailbreak the stills function to actually take photos of what the liveview is seeing while even in video mode-- taking stills always reverts backs to 16x9 or 3:2
now of course, one can put stills mode into 4:3 FF but again, no custom multi-sensor crop modes were ever made for the stills mode-- WHICH SHOULD BE SO EASY, especially one can already do a 2.66 video crop mode in 1080p resolution of the 16x9 mode.... apply the same type of functions to stills should not be hard
I personally am holding out for what sigma does in the APS-H quattro Foveon cams-- I did see an article they are now changing ot the lieca mount and immediately making a L-EF adaptor
I'd also wait to see what Fuji does in APS-C after their x-t3. Perhaps a flagship model will have a larger APS-H mode
The sony a7siii -- who knows whenever that will be out but it is certainly a hopeful contender
And upcoming Panasonic FF's could implement their multi-sensor modes from the GH line ~the most likely breakthrough...so yup, 1-2 years wait time ?

Love the post
- Yeah, I was advised on getting a Lomo square front (which is a non-projector lens setup) -- but where to get these and how to mount them and for what price?? I do not know but apparently these are the best option to shooting on a 35mm sensor size and get wide angles to 25mm
- on the modern end of this same approach there is the SLR Magic which does have a 2x front element screw on solution (I believe) but I don't know how wide they can go and they have a reversed nikon stlye focus pull and the marks on the dial are entirely silly with no ft or mm distances markers.
- For the projector lens route I was suggested the Kowa 16 series (3 different models numbers but are actually more-or-less the same)-- apparently, these do get down to 25mm on Micro 4/3 with a speed booster como but they are a 16mm projector lenses for starters... so it's alreay a far smaller image circle to start with and thus limiting the wide angle use on sensor sizes and 35mm cine lenses to start with.
- The 1.33 Letus pro does go as wide as 21mm -- which is amazing but I frankly have no interest in 1.33x squeezes or shooting on 16x9 sensors because the height is not the true Vfov as 4 perf 35mm (4:3 sensors) and would be like shooting the Arri Alexa classic with a 2x stretch. ~ big investment for a personal rig with not the desired results. On that note, Letus does have a 1.8x anamorphic front which is amazing but that still only derives 2.39:1 on a 4:3 sensor.
- On the single focus solutions front-- DNA-HD did just announce a new smaller adapter that is available now, but there is no test footage or confirmations on how wide it can go in combination with given scope and what format sizes it can fit up to (8mm, 16mm, 35mm) format wise.
All in all, there is still a camera issue anyway-- there are no APS-C or APS-H cams that have a 4:3 mode aside from that Sigma and there are also no FF cams that have an APS-H crop + 4:3 combination mode (this would be ideal... and perhaps the new Panasonic's will have this sensor option)
- On the micro 4/3 route-- the gh5s is obviously the way to go, but I still am a bit unsure as to which speed booster I would need-- to create a crop factor that retains the FOV of APS-H image sensor size at 26.7×17.9mm --which again, is the closest digital equivalent sensor size I have found to the ideal (4 perf 35mm) of 23.16mm x 18.16mm
- So yeah... if I'd need to do M4/3 (before investing a crap ton of money into an entire rig) I'd just need to figure out for starters which speedbooster gets my FF lenses closest to 23.16mm x 18.16mm when the camera is set to 4:3 mode to shoot anamorphic. Haven't found this info yet.

hello-- thanks for the response.
For your simple method- I'm already employing this with my canon 5diii using magic lantern to display custom crop marks atop the LiveView. Currently i'm using one for 2.55:1 with a rule of thirds grid line. 2.55 is my final exhibition format.
However, with this method, it doesn't get passed me that my HFOV is far wider than the same focal lengths of their 35mm film format and are also on a larger format to capture this virtual equivalent. Of course, this method just gets me the same perspective FOV but not with the true DOF and focal length combo as in 35mm cinema after knowing what FF focal lengths will give the same FOV after discovering the crop factor between the two formats.
If I were to do this on a digital stills camera, I found that if I were to shoot on an APS-H sensor size camera that employs a 4:3 mode then I would be the closest to the 4 perf film negative.
the only choice out there right now is this sigma-- which is a really appealing option, yet only has a stills mode and there is no mount adapter to use my EF lenses and I'd also have to get an external recorder simply to de-squeeze it's LiveView to take only stills.
https://www.sigmaphoto.com/sd-quattro-h-camera
Nonetheless, it would be interesting to know which is the best 2x anamorphic solution... that is NOT a projector lens attached.
A single focus non-projector lens 2x anamorphic solution that can go to wide angle focal lengths like 25mm when using a sensor size camera close to apsH
I don't think such a solution exists in the budget DIY adaptor realm but still interested to hear anyone's thoughts

One question I haven't asked-- I were to used an apsC camera like that Fuji X-T3 (which only has 16x9)-- if I were to attached an external recorder of some make & model --- do these external recorders have some sort of sensor override function? So do any allow for imposing a multi-sensor size function?
Just trying to find out if there is a work around where I could force a 4:3 sensor mode via an external recorder onto an apsC camera so that I could get 2.66 out of a 2X front element adapter

Hmmmm yeah I mean in many ways-- I am more so looking for a DLSR Stills Camera that can perform the duties of capture anamorphic images in-camera ~ So I can monitor the de-squeeze in camera and then have the ability to take a screen grab/screen capture/snap shot/ of that image.... (in other words, I can then avoid having to purchase and rig up an external recorder)
Because If you think about it: I know now that there are now reverse speed boosters (so I can fit APSC lenses onto my 5Diii and utilize a smaller image circle lenses attached to my 2X adaptor in order to go wider into focal lengths before vignetting) -- this idea won't work....So now i'm in the realm of buying a new camera that is micro 4/3 at $2300 and then a Speed booster to use APSC lenses, and then I gotta get the lenses (the two fuji cine zooms are easily set me back to $6000)
So it's like $9k to get this rig going. CRAZY
And to not have fujifilm and grain looks... or to have built in/burn in LUT options like on the Black Magic.... this is a tough sell
Ohh yeah and then the 2X adaptor is like $2k
So now it's an $11k rig. OUCH. So this is just the reality of this all since I can't use my 5D because it is not really a usable multi-sensor camera hack that allows me to actually utilize the focal lengths I want to be shooting in.... Ugh.... and even if I would save $1k by going with the black magic or Fuji X-t3- those 16x9 modes redrive only as wide as 2.40 on 1.33X adaptors or a super wide 4.00 aspect ratio with a 2X adaptors... but either of these options do NOT capture the real height Vfov that the same lens would see if it were used on a sensor on a 4:3 mode.
hmmmm there is simply just not enough choiced... really there is actually only one choice for users who want to capture actual 2.66 uncropped cinemascope format-- and that is the GH5 or GH5s
Please confirm